<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/style.css">
    <style>
        /*id选择器格式
        #id名称{
        }

        */
        #h1_name{
            color: gray;
        }
        .h1_class{
            color: green;
        }
        h1{
            color: red;
        }

    </style>
</head>
<body>
<h1 id="h1_name" class="h1_class">罗邹晨1</h1>
<h1 class="h1_class">罗邹晨2</h1>
<h1 class="h1_class">罗邹晨3</h1>
</body>
</html>